Consider the following statements with regard to the stage of life of a river:

1. At its youthful stage, the river travels swiftly across steep slopes forming gorges and V-shaped valleys by eroding its path.
2. Reaching its mature stage the river slows down, travels through plains, and widens its bed or valley floor along with forming meanders or big loops.
3. On attaining its old stage, the river's main task is to deposit alluvium across the flat plains, gradually forming distributaries and delta as it approaches the sea.

Which of the above statements is/are correct?